Air and gas valve mechanism for melting furnaces



A. J.v GRINDLE AIR AND GAS VALVE MECHANISM FOR MELTING FUR NAQES Filed Jan. 30, 1922 2 Sheds-Sheet 1 March 31. 1925.

1,5323%??? L A. J. GRINDLE AIR AND ems vuvau'ncmixsm FOR MELTINGV FURNACES Fudadn. 36, '1922 2 s neets- -sneaa Patented Mar. 3i, 1925.

UhliT-ED stares 1,531,3e2 ra'rsn'r OFFICE,

AUBREY J. GRINDLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO GRINDLE FUEL EQUIP- MENT COMPANY, OF HARVEY, ILLINOIS, A CORPORATION OF ILLINOIS.

Application filed January 30, 1922. Serial No. 532,864.

5 of illinois. hare, invented a certain new and useful improvement in Air and Gas Valve Mechanism for Melting l urnaces, of which the following is a spe-t'ilication.

This invention relates to melting furnaccs. it is specially adaptable to devices in which the heat producing material, such as oil, gas, or pmi'dcred coal. is delivered to the furnace under pressure from a nozzle or nozzles.

An, ohjeet is topri'nide an air circulating system which will keep certain valve mechanisms used in the device cool enough so that they are not injured in the operation of the machine. '7

The invention consists in a device capable of attaining the foregoing object, which can he. comparativel easily and cheaply made, which is satisfactory in use, and is not liable to get out of order. More particularly the invention consists in' many features and de tails of construction which will be hereafter more fully set forth in the specification and claims.

Referring to the drawings, in which like numerals designate the same throughout the smeral views- Figure l. is a plan View, certain parts l cing shown in section, of the mechanism of this invention n its preferred form;

Fign-o 2 is a sectional end View at approximately the line 2-2 of Figure 1-; and Figure 3 is an enlarged plan. View of the damper control mechanism appearing in Figure 1. The mechanism of my invention is shown associated with a regenerative furnace of the type wherein two i'nelting chiunhers IO and lil are placed in end to end relation. iitlfill end. of the furnace is provided with a large gas flue ill) or 32, having a discharge port, 3.4-. The lower end of gas fine terminates in large horizontally disposed gas pa. 1 so, while fine 32 terminates in another milar sized gas passage 38. These in" passages LG and S8 meet at a convenient point, in the case shown in Figure 1, hehind the furnace, and enter a common passage 40, delivering into a conventional sin-cl; e2 rising to any suitable height which the conditions of the given furnace may requ re.

Vertically reciprocatable of gas passage 36, at 01 innnediately adjacent its'entrance to passage 40 is a door 52 suspended from a chain or cable 54, passing over suitable pulleys 56 and 58 and having its opposite end attached to a correspondingly reciprocatable door 60 adapted to close passage 38 at or immediately adjacent to the point; where it enters flue 4-0. Owing to the fact that these two doors 52 and G0 are suspended on oppositeends of the cable 54 and the parts are proportioned as shown. one door rises as the other descends, thereby automatically opening one passage. as 38, to fine 40, and

closing the passage 36. or vice versa. Any

convenient, conventional mechanism may be provided for moving the cable 54 to cause this door movement. The particular mechanism shown in the drawing for this pur. pose includes a shaft driving pulley 58. said shaft carryingga hand wheel (i l manually operatable in obvious manner.

As the furnace is intended for use in nielting' materials requiring ahigh temperature. the furnace is built in general conventional manner of refractory material, and this is true of the roof 66 of passage 36. The root 66 is, however, provided immediately adjacent to the door 52 witha vertical port, 68 leading to a chamber 70 aboyethe root 66, which is selectively elosablofby a door 72 hinged at 74:. This door ,72 may beopcned -a1id': c'-losed hy any suitable means, the particular one shown in the drawing being a chain 76 adapted to wind about shaft 62 so that when the operator manipulates wheel 64 to raise door 52. door 72 'iii. also he opened. Door 72 closes-by the action of gravity whenever the wheel (ii-is moved in the opposite, direction to lower'the door 52. Door 72 has a door section v ifi hinged thereto which door section is pro pi h-d with a perforation 7% ol sullieient size sii'thal the rope 5i may freely pass through it. and also so that a suitable quantity of air can pass downwardfrom the outside. first into chamber 70 then through passage 68 into passage 36, even though door 72 may be closed. It for any reason the sizeof this opening 78'is not sullicicnt to admit the desired amount ofairfor the purposes hereafter de scribed, door section 78 may be folded back 4 upon the door proper 72 as indicated b dotted lines in Figure 5 to provide a larger opening for the admission of air into cham- 

